Mist coat for render - paint

kerri_gt

We've had some raised beds built in our garden and rendered, the builder has advised we do a mist coat before painting properly.

My question is which paint to use for the mist coat? We're still in the process of choosing the final colour so I can't just water down what we're using. I read just a standard emulsion is fine, but the one we have handy is a vinyl matt which I then read isn't great to use as a mist coat as it can cause the top coats to peel. Would this be likely if I'm misting render which will be painted with masonry paint and not smooth plaster?

FreeBear

Don't think you really want to be using an interior emulsion on an exterior surface. Some masonry paints specify a particular primer when going over fresh bricks/render (silicate paints spring to mind). Always check with the manufacturer to see what they recommend.

It is probably a good idea to wait a couple of months before painting the render - This will give the cement time to fully cure and dry out... As the weather is becoming more changeable, it might pay to wait until next spring before painting.

Davesnave

I left my newly rendered walls unpainted for 6 months and then just watered down the first coat of exterior masonry paint by about 10%. Had no problems.

kerri_gt

FreeBear wrote: »

Don't think you really want to be using an interior emulsion on an exterior surface. Some masonry paints specify a particular primer when going over fresh bricks/render (silicate paints spring to mind). Always check with the manufacturer to see what they recommend.

The builder that did the rendering advised he already incorporated the necessary sealants within the render mix hence we don't require a specialist primer and a mist cost is all that is needed.

I'm really hoping to get this painted before the winter (job was supposed to be completed before the summer but that's another story) so we're not looking out at a half finished job for yet another 6 months.

I was hoping to get at least the mist coat done on some part so we can choose the masonry paint colour and that's at least something done - we've got a few testers on the beds atm but I'm not convinced it's a true reflection of the colour because they're direct on the render without the mist cost underneath.

TheCyclingProgrammer

How about using a breathable masonry paint and using a slightly diluted coat first?